If the OnePlus smartphone is automatically locked by the set sleep mode countdown, by default the device will remain unlocked for 5 seconds with the display off, which means that the device could be accessed again without entering the unlock method (pattern/PIN/password).

In the lock screen settings, we can set the time until the automatic lock after the sleep mode comes into effect as follows:

Android 10 (OxygenOS 10.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Security & lock screen
Step 3:  Open the  Settings
Step 4:  Tap on  Automatically lock after sleep
Step 5:  Choose an  option
  1. Open the Settings
  2. Tap on Security & lock screen
  3. Open the Settings
  4. Tap on Automatically lock after sleep
  5. Choose an option

OnePlus Instructions
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